Fix whitespace linter trap

When the linter fails due to trailing whitespaces, the trapped
dump_logs.sh execution will attempt to collect logs using kubectl,
which is not installed, causing further errors in the log.
This patch set prevents the log gathering if kubectl does not
exists.

Change-Id: I83c13caec2ece7cc8ec9bfd838ae7d4af9dcbed3

tools/gate/dump_logs.sh

@@ -1,5 +1,12 @@
 #!/bin/bash
 set +xe
+
+# if we can't find kubectl, bail immediately because it is likely
+# the whitespace linter fails -  no point to collect logs.
+if ! type "kubectl" &> /dev/null; then
+  exit $1
+fi
+
 echo "Capturing logs from environment."
 
 mkdir -p ${LOGS_DIR}/k8s/etc